There's a near-universal sense that the U.S. healthcare system is a heaving mess, rife with errors and injustices. It's expensive, too. So how do we fix health care? That's the question Bloomberg Businessweek Chairman Norman Pearlstine put to our esteemed panel: Dr. Ralph de la Torre, chairman and chief executive officer of Steward Health Care System; Dr. Gregory Curfman, executive editor of the New England Journal of Medicine; Gail Wilensky, economist and senior fellow at Project HOPE; Ronald Williams, former chairman and CEO of Aetna; and Jonathan Bush, CEO, president, and chairman of Athenahealth.